JPH036458A - Bearing apparatus for axle equipped with wheel rotational speed detector - Google Patents

Abstract

PURPOSE:To facilitate handling by a method wherein the circuit receiving part of a rotational speed detector is mounted on the outer surface of an outside member in a state embedded in the outside member and extending in the axial direction so that a detection end is opposed to a part to be detected. CONSTITUTION:A piercing hole 7d is provided to an external member 7 at the position corresponding to the part 13 to be detected provided to an internal member 1 in the axial direction and a rotational speed detector 15 having an almost L-shape is mounted to said hole 7d. This detector 15 is constituted of a detection part 18 having a magnetoresistance element 16 as a sensor and a magnet 17 successively arranged thereto from the leading end thereof and a circuit receiving part 20 connected to said detection part 18 and extending in an orthogonal direction and receiving a printed circuit board 19 processing the signal of the element 16. Therefore, the protruding dimension from the outer surface of the member 7 of the detector 15 in the state mounted to the member 7 can be suppressed to the low level corresponding to the dimension of the receiving part 20 in the diameter direction thereof and transport and chassis assembling become easy.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention detects, for example, the rotational speed of a wheel using a rotational speed detector, and uses the detected rotational speed to prevent the wheel from locking during sudden braking. Anti-lock brake system (hereinafter referred to as ABS) that controls the brakes
The rotating inner member has a detected part, while the outer member has a detecting end part containing a sensor facing the detected part, and a detecting end part connected to the detecting end part. <Prior art> Concerning an axle bearing device to which a rotation speed detector is attached, which includes a circuit housing section including a circuit for processing a signal detected by the above-mentioned sensor. The rotation speed detector that is used in this system constitutes the main part of the ABS as described above, and therefore requires not only high detection accuracy, but also extremely high earthquake resistance and honeymoon resistance in order to maintain this high detection accuracy. Otherwise, the detector may be damaged by vibration or water may enter the detector, causing the rotation speed detector to malfunction or malfunction, which may lead to a serious accident.

By the way, it is desirable that the rotational speed detector mounted on the axle bearing device be small in size, in order to reduce the constraints on space and make the axle bearing device more compact. However, with the current state of technology, in order to ensure the high seismic resistance and sealing performance described above, the rotation speed detector must be large, and it is not possible to completely embed the rotation speed detector in the outer member. I can't go.

Conventionally, as an axle bearing device equipped with such a wheel rotation speed detector, as shown in FIG. 18, the rotation speed of the inner member 104 is detected by the rotation speed detector 112. (for example, U.S.P.
No. 4,778,286, etc.).

<Problems to be Solved by the Invention> However, in the above conventional axle bearing device equipped with a wheel rotation speed detector, the rotation speed detector +12 has a cylindrical shape that simply extends in the uniaxial direction. In addition, since the rotational speed detector 112 cannot be sufficiently miniaturized at the current state of the art, the rotational speed detector 112 is mounted on the outer member 1.
06 so that the detection end 110 faces the detected portion 103 of the inner member 104, the circuit storage portion 11
There has been a problem in that the first side protrudes more radially outward than the outer surface of the main body of the outer member. Although the rotational speed detector 1120 is shown to be small in FIG. 18, in reality, it would be large if a signal processing circuit is housed therein, and the rotational speed detector 112 would actually be a small one.
It protrudes outside of 5. In this way, if the rotational speed detector 112 protrudes greatly, it may be difficult to transport or assemble the bearing device.
The wheel attachment protruding outward at one end 101a of 01 has a flange portion 102, and a through hole 104a at the center thereof is penetrated by an axle (not shown), and
An inner member 104 having a detected portion 103 consisting of a plurality of protrusions 103a103a projecting outward in the radial direction at regular intervals in the circumferential direction on the main body portion +01;
an outer member +06 which is arranged coaxially with the outer member +04 and is fixed to the soyarn (not shown) at a mounting portion +05; and the inner member +06.
A plurality of rolling members 107,107. ．． 107.107. is attached to the outer member 106, and the inner member 1
A detection end 110 including a sensor that is not shown in the figure and facing the detected part +03 of 04 and this detection end 110
and a cylindrical rotational speed detector 112 extending in a substantially radial direction, which is connected to a circuit housing part 111 that includes a circuit (not shown in the figure) that processes the signal detected by the sensor. The axle bearing device cannot be easily handled because the protruding rotational speed detector 112 is damaged by hitting other members or receiving unexpected external force.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the rotation speed detector from protruding significantly from the outer surface of the outer member when it is attached to the outer member so that its rotation detection end faces the detected portion of the inner member. Therefore, it is an object of the present invention to provide an axle bearing device equipped with a wheel rotation speed detector that can be easily handled.

<Means for Solving the Problems> In order to achieve the object described above, the present invention has a main body and a flange for a wheel attachment protruding outward at one end of the main body, and has the above-mentioned object. an inner member having a detected portion consisting of a plurality of protrusions provided at regular intervals in the circumferential direction on a main body portion; an outer member disposed coaxially with the inner member and fixed to the chassis; and a raceway surface of the inner member. and a detection end portion that is attached to the outer member and includes a sensor facing the detected portion of the inner member; an axle equipped with a wheel rotation speed detector, the wheel rotation speed detector comprising: a circuit housing section including a circuit for processing a signal detected by the wheel; A bearing device for
The rotational speed detector has a substantially I7-shaped shape, and the detection end portion is embedded in the outer member and extends in a substantially radial direction so as to face the detected portion, while the detection end portion is located in the circuit housing. is placed on the outer surface of the outer member so as to extend in the axial direction, and the circuit housing portion is located radially inward than the outer surface of the flange.

ing.

<Function> As described above, the circuit housing part of this rotational speed detector extends in the axial direction on the outer surface of the outer member as described above, with the detection end part facing the detected part. Therefore, the conventional circuit housing part of the rotational speed detector simply extends in the uniaxial direction from the detection end. The inner member 7 is arranged coaxially with the inner member 1 and has a plurality of flange parts 7a that protrude outward in the radial direction.
(See FIG. 2) is a generally cylindrical outer member. Further, 8.9 is a movable member between the raceway surfaces 3a and 4a provided on the outer periphery of the raceway members 3 and 4 of the inner member 1 and the raceway surfaces 7b and 7c provided on the inner periphery of the outer member 7, respectively. Fitted rolling member, 10. II is arranged between the raceway member 3.4 and the outer member, and is connected to the double row of rolling members 8, 8.・・・
,9,9. It is a retainer that holds the ... at regular intervals in the circumferential direction. The inner side +AI is the double row rolling member 8.8.9, 9. It is rotatably supported by the outer member 7 via... Raceway member 3 included in the inner member 1
, the rolling members 8, 8 . ..., 99,
An annular member 12 is fixed at an intermediate position in the axial direction of the annular portion +['! 2, a plurality of protrusions 13a, 13a, protruding in the radial direction at regular intervals in the circumferential direction.
A detected portion 13 consisting of... is formed. Also,
The flange portion 6 of the inner portion +Al does not protrude radially outward by a large amount, but protrudes by an amount corresponding to the dimension in the direction perpendicular to the axial direction of the circuit housing portion. The circuit housing portion is located radially inward from the outer surface of the flange portion of the inner member for mounting the wheel.

The sensor included in the detection end of the rotational speed detector detects passage of each protrusion of the detected portion in the circumferential direction. Then, a signal corresponding to the passage of each protrusion of the detected part in the circumferential direction is transmitted.
- Send to the circuit stored in the circuit storage section. The circuit that receives the signal from the sensor performs predetermined processing on the signal from the sensor and outputs a signal that corresponds to the rotational speed of the inner member.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is an axial cross-sectional view of a first embodiment of an axle bearing device equipped with a wheel rotation speed detector according to the present invention, in which numeral 1 indicates a cylindrical portion 2 and an annular track fitted onto the cylindrical portion 2. Part 3.4
A substantially cylindrical main body 5 consisting of the above, and a wheel (not shown) is attached to one end 5a of the main body 5. This inner member 1 is hollow so that it is penetrated by an axle (not shown) and driven as a driving wheel, but it can also be used as a non-driving wheel (driven wheel), in which case the inner member 1 is inserted into the axle. There is no need to penetrate the
It does not have to be hollow. On the other hand, the outer member 7 is fixed at its flange portion 7a to a suspension portion provided on the chassis of an automobile (not shown).

A through hole 7d having a predetermined diameter and penetrating in the radial direction is provided at a position of the outer member 7 corresponding to the detected portion 13 in the axial direction, and this through hole 7d is shown in FIG. No indication
; It opens approximately at the center of the plane 7e extending in the direction orthogonal to the radial direction of the outer member 7, and penetrates through it in the radial direction.

As shown in FIG. 1, on the plane 7d of the outer member 7,
A rotation speed detector 15 having a substantially I7 shape is attached. This rotational speed detector 15 has a cylindrical shape with a diameter equal to the diameter of the through hole, and a detection end 18 in which a magnetoresistive element 16 and a magnet 17 as a sensor are arranged in order from the tip side. and a substantially rectangular parallelepiped-shaped circuit housing portion 20 that is connected to the detection end I8 and extends in a direction perpendicular to the axis of the detection end 18. The circuit housing section 20 has a circuit board 19 therein that constitutes a circuit (details will be described later) for processing signals from the magnetoresistive element 16.
is stored. As shown in the figure, the detection end portion 18 is embedded in a through hole 7d extending in the radial direction.
Its tip face faces the outer circumferential surface of the protrusion 13a of the detected portion 13 of the inner member I with a constant gap d1 maintained in the radial direction. Thereby, the magnetoresistive element 18 disposed on the tip side of the detection end portion 18 and the detected portion 13 of the inner portion II'I are maintained at a predetermined distance in the radial direction.

On the other hand, in the circuit housing portion 20, the detection end portion 18 is connected to the through hole 7d.
It is placed on the plane 7e so as to extend in the axial direction indicated by X in the figure while being maintained in the radial direction. This rotational speed detector 15 is connected to the second
The magnet I7 disposed at the end 18 is connected by bolts 21 inserted through plate-shaped protrusions 20a, 20a, which are protruded in the width direction on both sides substantially perpendicular to the width direction indicated by W in the figure. The generated magnetic field penetrates the magnetoresistive element 16, which is located on the tip side of the magnet 17 and faces the detected portion 13 of the inner portions t, l' 1 with a constant gap in the radial direction. , reaching the detected part 13.

When the inner member 1 rotates together with the wheels, it is fixed to the track member 3 of the inner member 1, and the detected portion I3 is attached to the outer periphery.
The annular member 12 formed thereon rotates together with the inner member l.

Then, the strength and direction of the magnetic field penetrating the magnetoresistive element I6 change according to the passage of the protrusion 13a of the detected portion 13 in the circumferential direction, and the resistance value of the magnetoresistive element 16 changes accordingly. A signal A (see FIGS. 3 and 4(a)) whose voltage changes in accordance with passage of the protrusion +3a of the detected portion 13 in the circumferential direction is extracted from the magnetoresistive element I6.

As shown in FIG. 3, the signal A detected by the magnetoresistive element 11 is input to a comparator 30 provided on a circuit board 19 disposed within the circuit storage portion 20. On the other hand, this comparator 30 is also attached to the outer member 7. In this state, the circuit storage part 2 of the rotation speed detector 15
The outer surface 2 of the engaging portion 20d protruding from the end of the back surface 20b of 0
0d-1 is located radially inward from the outer circumferential surface 6a of the flantz portion 6 of the inner member 1. As shown in Figure 1,
The magnetoresistive element 16 and the circuit provided on the circuit board 19 are connected by a lead wire 22 .

The output from the circuit board 19 whose periphery is molded with resin P and sealed is connected to the connector section 24 formed in the circuit storage section 20 so as to open at the end surface 20c far from the detection end section 18. Manual power is applied to the ABS (not shown) via terminals 25.25 provided axially protruding from the bottom surface. The engagement protrusion 20d engages in the axial direction with an engagement portion of a mating member (not shown) fitted into the connector portion 24. This rotational speed detector 15 has sufficient consideration given to earthquake resistance, sealability, etc. In addition, in the figure, 26 is a bulkhead installed between the terminals 25 and 25, and 27, 27 is a partition between the outer member 7 and the track member 3.
, 4.

In the above configuration, the detection 2 of the rotational speed detector 15 is the reference voltage generating circuit 3I installed on the circuit board 19.
Therefore, a reference signal B (see FIG. 4(b)) as a comparison standard is input. The comparator 30 that receives this reference signal B and the signal A from the magnetoresistive element 17 compares this reference signal B and the signal A, and when the signal A exceeds the reference voltage Vst of the reference signal B, it becomes a high level. , otherwise the signal C becomes low level (Fig. 4(c),
(d)) is output.

The signal C from the comparator 30 is taken out from the terminal 25.degree. 25 of the connector section 24 provided in the circuit storage section 20. This signal C has a frequency that depends on the rotational speed, that is, the angular velocity, of the inner member 1 and the wheels.

As described above, this axle bearing device includes a cylindrical detection end 18 that includes a magnetoresistive element 16 as a sensor, and a columnar detection end 18 that extends in a direction perpendicular to the detection end 18 and includes the magnetoresistive element 1.
6, a detection end 18 of the rotation speed detector 15 is provided.
A through hole 7d provided in the outer member 7 and extending in the radial direction
The magnetoresistive element 16 disposed at the tip of the detecting end 18 is buried so as to face the detected part I3 provided in the inner member 1 with a predetermined distance therebetween, and the detecting end The circuit housing portion 20, which is provided to extend in a direction perpendicular to the detection end portion 18 and connected to the detection end portion 18, is connected to the outer portion l7.
17 so as to extend in the axial direction X,
This rotational speed detector 15 can be removed from the outer member 7. Therefore, in the axle bearing device equipped with this rotational speed detector 15, if the rotational speed detector 15 is attached to the outer member 1 (= I digit state) The protrusion dimension can be kept small according to the radial dimension of the circuit storage part 2o (see the middle part of FIG. 2). Unlike the circuit housing part side of a rotational speed detector that extends in the direction, the circuit housing part 20 does not protrude significantly outward in the radial direction from the outer surface of the outer member 7.
5 located at the radially outermost position in the rotational speed detector 15, and as in the first embodiment, the protrusion 13 of the detected portion (3)
The signal A (see FIG. 7(a)) whose voltage changes according to the circumferential passage of a, 13a, etc. is connected to the AC coupling 3
6 (see FIG. 6), only the AC component thereof is allowed to pass (see the broken line waveform in FIG. 7(a)), and then a constant offset signal D input from the offset voltage generation circuit 37 (offset voltage Vof) and is converted into a signal A' as shown in FIG. 7(b). This signal A is then input to the comparator 38. A.C.
The comparator 38 which receives the signal A' from the coupling 36 compares this signal with the reference signal B (see FIG. 7(c), standard voltage Vst) from the reference voltage generation circuit 39. When the signal A° exceeds the reference voltage Vst twice, a high level signal is output, and otherwise a low level signal C is output (see FIGS. 7(d) and (e)). This signal C has a frequency that depends on the angular velocity of the inner member.

In this way, in the circuit including the AC coupling 36 and the offset voltage generation circuit 37, the engaging portion 20
The outer surface 20d-1 of the inner member 1 can be located far inward in the radial direction than the outer peripheral surface 6a of the flange portion 6 of the inner member 1. Therefore, the axle bearing device equipped with this rotational speed detector 15 is easier to transport and assemble into a chassis than the conventional axle bearing device equipped with a rotational speed detector. be able to. Of course, an accurate signal C corresponding to the rotational speed of the inner member 1 can be extracted from the rotational speed detector 15.

FIG. 5 is a block diagram showing a rotation speed detector 35 of a second embodiment of an axle bearing device equipped with a wheel rotation speed detector according to the present invention. The rotational speed detector 35 of this second embodiment is constructed on the rotational speed detector I5 of the first embodiment and a circuit board 19 housed in the circuit storage section 20, and receives a signal A from the magnetoresistive element 16. The only difference is in the circuit that processes the signal A from the magnetoresistive element 16, which is processed by this circuit.
Only the processing will be explained with reference to FIG.

In FIG. 5, if the signal A from the magnetoresistive element 16 is processed by the magnetoresistive element 16, even if there are variations in the average signal level of the signal detected by the magnetoresistive element 16, this The AC coupling 36 and the offset voltage generation circuit 37 convert the signal A into a signal A that always changes around a constant offset voltage of
Therefore, the magnetoresistive element 1
It is possible to eliminate the influence of the variation in detection performance described in No. 6 on rotational speed detection. Other functions and effects are the same as those of the first embodiment.

FIG. 8 is a block diagram showing a rotation speed detector 45 included in a third embodiment of an axle bearing device equipped with a wheel rotation speed detector according to the present invention. The rotational speed detector 45 of the third embodiment is also the same as the rotational speed detector 15 of the first embodiment except for the circuit that processes the signal from the magnetoresistive element 16. Only this circuit will be explained with reference to FIG.

In the comparator 44, the signal A detected by the magnetoresistive element 16 (see FIG. 9(a)) and the signal A° 9(a)) are compared. and,
This comparator 44 outputs a signal C (see FIG. 9(b)) which becomes high level when the above-mentioned signal A°" exceeds signal A, and becomes low level otherwise. The signal C has a frequency depending on the angular velocity of the inner member 1.The voltage levels of the signals A and A'' compared by the comparator 44 are always the same regardless of the magnetoresistive element 16. In this way, as shown in FIG. According to the circuit shown in , it is possible to eliminate the influence of variations in detection performance of the magnetoresistive element 16 on rotational speed detection. Further, a reference voltage generation circuit is not required. Other functions and effects are the same as those of the first embodiment.

FIG. 1O is a block diagram showing a rotational speed detector 55 of a fourth embodiment of an axle bearing device equipped with a wheel rotational speed detector of the present invention. Rotational speed detector 55 of this fourth embodiment
Also, since the rotational speed detector 15 of the first embodiment is the same except for the circuit that processes the signal A from the magnetoresistive element I6, only this circuit will be explained with reference to FIG. explain.

As shown in FIG. 10, the signal A detected by the magnetoresistive element 16 (see FIG. 11(a)) is transmitted to the clamp circuit 46 by the clamp signal A"' of the Ov clamp (see FIG. 11(b)).
(see) and then sent to the comparator 47. The comparator 47 compares this clamp signal A'' with the reference signal B (see FIG. 2(c), reference voltage Vst) from the reference voltage generation circuit 48, and determines whether the clamp signal A'' exceeds the reference signal B. It outputs a signal C (see Fig. 11 (d) and (e)) which is high level when the condition is reached, and low level otherwise.Of course, this signal C has a frequency corresponding to the angular velocity of the inner member. In this way, after the signal A from the magnetoresistive element 16 is Ov-clamped by the clamp circuit 46, it is compared with the reference signal B of the predetermined reference voltage Vst, so that Only the change in the signal A can be compared with the reference signal B, and therefore, the influence of variations in the detection performance of the magnetic paper 9 and the anti-element I6 on rotational speed detection can be eliminated.Other effects are as follows. 1st above
It is the same as the example.

In the above embodiment, as shown in FIG. 1, the rotational speed detector 15 has a magnet 17 disposed at the detection end X8 so as to be adjacent to the magnetic resistance element 16 disposed at the tip thereof. However, as shown in FIG.
0 and the magnetoresistive element 16 disposed at the tip of the detection end 18.
A yoke 61 may be interposed between the magnet 60 and the magnetoresistive element 16, and the yoke 61 may magnetically connect the magnet 60 and the magnetoresistive element 16.

Further, in the above embodiment, as shown in FIG. A plurality of lead wires 22 were wired along the outer surface of the cylindrical magnet I7.
As shown in Figures (a) and (b), a through hole 63a is provided in the magnet 63 in the axial direction 0 of the detection end 18 to connect the magnetic resistance element I6 and the circuit of the circuit board (not shown). A plurality of lead wires 22 to be connected may be routed through this through hole 63a.

Further, as shown in FIG. 12, a yoke is interposed between the magnet 20 disposed in the circuit housing portion 20 of the rotational speed detector 15 and the magnetoresistive element I6 disposed at the tip of the detection end I8. In the above embodiment, as shown in FIG.
An L-shaped hole 65c communicating with the side surface of the magneto-resistance element 16 and a circuit on a circuit board (not shown) is wired through the hole 65c. Good too.

Further, in the above embodiments shown in FIGS. 12 and 14, as shown in FIG. 15, the magnetoresistive element I6 and the magnet 6
The outer surface of the yoke 67, which is interposed between the detection end portion 18 and the detection end portion 18 and extends in the direction of the axis of the detection end portion 18, may be surrounded by a cylindrical magnet 68 having polarity as shown. With this arrangement, the lines of magnetic force generated by the magnet 60 can be efficiently guided to pass through the magnetoresistive element 16. Moreover, magnetic influence from the outside can be prevented. The above magnet 6
The magnetic force of 0 is set to be sufficiently larger than that of the cylindrical magnet 68.

Further, in the above embodiment, the rotational speed detector 15 is provided with fixing parts 20a, 20a projecting in the widthwise direction on both sides of the circuit storage part 20 in the widthwise direction indicated by W in FIG. , 20a to the outer member 7,
Although it was attached to the outer member 7, as shown in FIG.
, 20a is removed, and its detection end 18
The rotational speed detector 15 may include a large-diameter fitting portion 18a and be attached to the outer member 7 by press-fitting the fitting portion 18a into a through hole 7d provided in the outer member 7 in the radial direction. Further, as shown in FIG. 17, the circuit housing section 20
A dedicated protrusion 70 is installed parallel to and at a predetermined distance from the detecting end I8, and is embedded in the detecting end I8 and extends approximately radially so as to face the detected part. A circuit accommodating portion including a circuit for processing a signal detected by the sensor is placed on the outer surface of the outer member so as to extend in the axial direction, and the circuit accommodating portion is connected to the substantially cylindrical portion of the inner member. The wheel attachment protruding outward at one end of the main body is located radially inward from the outer surface of the flange. Therefore, according to the present invention, the circuit housing portion does not protrude outward in the radial direction. Therefore, the axle bearing device equipped with the wheel rotation speed detector of the present invention is easier to transport in a container or to be assembled into a chassis than the conventional axle bearing device equipped with a wheel rotation speed detector. You can go there.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view of a first embodiment of an axle bearing device equipped with a wheel rotation speed detector according to the present invention, FIG. Block diagram showing the rotational speed detector of the embodiment, Fig. 4(a), (b), (
c) and (d) respectively show the signal theory in Fig. 3.The protrusion 70 is mounted in the radial direction separately from the through hole 7d for embedding the detection end 18 provided in the outer member 7 by press-fitting it into the hole. By doing so, the rotational speed detector 1 attached to the outer member 7
It may be 5°°. Further, in the above embodiment, the rotation speed detectors 1515°, 1
The protrusion 1 of the detected part 13 is arranged at the detection end 18 of 5".
A magnetoresistive element 16 was used as a sensor for detecting passage of the parts 3a, 13a, etc. in the circumferential direction.
It goes without saying that the sensor for detecting the passage of the protrusions 13a, 13a, . . . 3 in the circumferential direction is not limited to a magnetoresistive element. Furthermore, it goes without saying that the direction in which the sensor and the detected portion face each other is not limited to the radial direction, but may be, for example, the axial direction or a direction inclined at a certain angle with respect to the axial direction. <Effects of the Invention> As is clear from the above, according to the present invention, the wheel rotation speed detector has an abbreviated shape consisting of a detection end portion and a circuit storage portion, and has a 5 is a block diagram showing a rotational speed detector according to a second embodiment of the present invention. Figure 6 is an explanatory diagram of the AC coupling in Figure 5, Figure 7 (a), (b), (c),
(d) and (e) are respectively explanatory diagrams of the signals in FIG. 5, FIG. 8 is a block diagram showing the rotation speed detector of the third embodiment of the present invention, and FIGS. 9(a) and (b) are respectively An explanatory diagram of the signals in FIG. 8, FIG. 10 is a block diagram showing the rotational speed detector of the fourth embodiment of the present invention, and FIG. 11(a).
(b), (c), (d), and (e) are explanatory diagrams of the signals in Fig. 1O, Fig. 12, and Fig. 13 (
a), (b), Fig. 14 (a), (b),
(c), Figure 15 (a), (b), (c)
, FIGS. 16(a)(b) and 17(a),
13(b) is an explanatory diagram of other embodiments (FIG. 13(b) is a sectional view taken along the xmb-xmb line of FIG. 13(a), and FIG. 14(b)
) and (c) are XIVb-XIVb in FIG. 14(a), respectively.
Cross-sectional view along the line XIVc-XIVc, Figure 15(b)
, (c) are cross-sectional views taken along the xvb-xvb line and χVc-XVc line in FIG. 15(a), respectively. FIG. ) is the 17th
FIG. 18 is an axial cross-sectional view of an axle bearing device equipped with a conventional wheel rotation speed detector. ■... Inner member, 3a, 4a... Raceway surface of inner member,
5. Main body, 5a, one end, 6, flange, 6a.
Outer surface of Franz portion, 7...Outer member, 7 b, 7 c
... Raceway surface of outer member, 7d - Through hole, 7e - Plane, 8.9 - Rolling member, 13 - Detected part,
13a protrusion, 15.35, 45, 55.15', +
5"・Rotation speed detector, 16・Magnetic resistance element (sensor), 18...Detection end, 19...Circuit board, 20・
Circuit storage, A signal.

Claims (1)

[Claims] (1) It has a main body part and a flange part for attaching a wheel that protrudes outward at one end of the main body part, and a detected part consisting of a plurality of protrusions provided at regular intervals in the circumferential direction on the main body part. an outer member disposed coaxially with the inner member and fixed to the chassis; a rolling member disposed between a raceway surface of the inner member and a raceway surface of the outer member; and an outer member attached to the outer member. A rotation speed detector comprising: a detection end portion including a sensor facing the detected portion of the inner member; and a circuit storage portion connected to the detection end portion and including a circuit for processing a signal detected by the sensor. and a wheel rotation speed detector configured to detect the rotation of the inner member by a rotation speed detector, the rotation speed detector having a substantially L-shape. The detection end portion is embedded in the outer member and extends substantially radially so as to face the detected portion, while the circuit housing portion is placed on the outer surface of the outer member so as to extend in the axial direction. An axle bearing device, wherein the circuit housing portion is located radially inward from an outer surface of the flange.